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本文用一个简单的斜压两层模式,在热力学方程中只考虑牛顿冷却和感热加热,从理论上分析了大尺度海温异常时感热加热对热带大气Kelvin波的影响。研究发现,牛顿冷却使大气Kelvin波振幅衰减,并使波速减慢;感热加热可使得Kelvin波波速加快;当海气温差超过某一临界值时,波动趋于不稳定。
In this paper, only a simple two-layer baroclinic model is used, and only Newton cooling and sensible heat heating are considered in the thermodynamic equations. The effect of sensible heat heating on the Kelvin waves in tropical atmosphere is analyzed theoretically. The results show that the Newtonian cooling attenuates the amplitude of atmospheric Kelvin waves and slows down the wave velocity. The sensible heating increases the wave velocity of Kelvin waves. When the temperature difference exceeds a critical value, the fluctuations tend to be unstable.